<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <link rel="stylesheet" href="bootstrap/css/bootstrap.css">
    <title>Document</title>
    <style>
        #list{
            display: none;
        }
    </style>
</head>
<body>
    <div class="container">
        <div style="padding: 100px 100px 10px;">
                <form class="form-inline" role="form">
                    <div class="row">
                        
                        <select name="" id="" class="form-control"> 
                            <option value="option1">--请选择查询项--</option>
                            <option value="option2">房间号</option>
                            <option value="option2">房间类型</option>
                            <option value="option2">护理级别</option>
                            <option value="option2">居住方式</option>
                            <option value="option2">入住状态</option>
                        </select>
                        
                            <div class="input-group">
                                <input type="text" class="form-control" placeholder="搜索关键字">
                                <span class="input-group-btn">
                                    <button class="btn btn-default" type="button" id="search">search</button>
                                </span>
                            </div><!-- /input-group -->
                    </div>
                    <div id="list">
                        <ul>
                            <li>001</li>
                            <li>hhh</li>
                            <li>mmm</li>
                            <li>jjj</li>
                            <li>999</li>
                        </ul>
                    </div>
                </form>
            </div>
    </div>
</body>
<script>
    var search = document.getElementById("search");
    var list = document.getElementById("list");
    search.onclick = function(){
        list.style.display = "block";
    }
</script>
</html>